You know, my boy, he said, it's impossible to love men such as they are. And yet we must. So try to do good to men by doing violence to your feelings, holding your nose, and shutting your eyes, especially shutting your eyes. Endure their villainy without anger, as much as possible; try to remember that you're a man too. For, if you're even a little above average intelligence, you'll have the propensity to judge people severely. Men are vile by nature and they'd rather love out of fear. Don't give in to such love: despise it always.

Right attitudes produces right action

Suffering is part and parcel of extensive intelligence and a feeling heart.

What is hell? I maintain that it is the suffering of being unable to love.

I am too young and I've loved you too much.

You see, gentlemen, reason is an excellent thing, there’s no disputing that, but reason is nothing but reason and satisfies only the rational side of man’s nature, while will is a manifestation of the whole life, that is, of the whole human life including reason and all the impulses. And although our life, in this manifestation of it, is often worthless, yet it is life and not simply extracting square roots.

Existentialism isn't so atheistic that it wears itself out showing that God doesn't exist. Rather, it declares that even if God did exist, that would change nothing.